Function checkUvBinaryVersion

packages/python/src/uv.ts:368–405

(uvPath: string)

 * or it's older than the minimum — uv is unusable in all of those cases.
 */
export function checkUvBinaryVersion(uvPath: string): string {
  let output: string;
  try {
    output = execFileSync(uvPath, ['--version'], {
      encoding: 'utf8',
      stdio: ['pipe', 'pipe', 'pipe'],
      shell: isWin,
    }).trim();
  } catch (err) {
    throw new NowBuildError({
      code: 'UV_ERROR',
      link: 'https://vercel.link/python-version',
      message: `Found uv at "${uvPath}" but could not run "uv --version": ${
        err instanceof Error ? err.message : String(err)
      }`,
    });
  }

  // `uv --version` prints e.g. `uv 0.9.25 (<hash> <date>)`.
  const found = semver.coerce(output);
  if (!found) {
    throw new NowBuildError({
      code: 'UV_ERROR',
      link: 'https://vercel.link/python-version',
      message: `Could not determine the uv version from "${output}".`,
    });
  }

  if (semver.lt(found, MIN_UV_VERSION)) {
    throw new NowBuildError({
      code: 'UV_VERSION_TOO_OLD',
      link: 'https://vercel.link/python-version',
      message: `Found uv ${found.version} at "${uvPath}", but Vercel requires uv ${MIN_UV_VERSION} or newer. Please upgrade uv: https://docs.astral.sh/uv/getting-started/installation/`,
    });
  }

  return output;
}

export async function getUvBinaryOrInstall(
  pythonPath: string